PROCESS AND CONSTRUCTIVE SOLUTION FOR MANUFACTURING TWIN BLADES WITH LARGE EXTERNAL DIAMETER FOR HORIZONTAL SHAFT WIND TURBINE

摘要

The invention relates to a process and to a constructive solution for manufacturing twin blades with large outside diameter for horizontal shaft wind turbine. According to the invention, the process consists in that, in order to increase the resisting moment, at the base of said blade (1), there is carried out a configuration of a twin blade (4), said configuration being formed of a blade (1) with horizontal shaft and another blade or more blades (5), similar or identical to the first blade, as shape and length, placed one behind the other, in the wind axial direction, forming a system (a) of blades stiffened to one another, the twin blade (4) being additionally reinforced in the rotation plane on both sides. According to the invention, the constructive solution, carried out by applying said process, comprises a twin blade (4) comprising a blade (1) and one or more blades (5), similar to or identical to the first blade (1), placed on an axial direction, parallelly or inclinedly, closer to the apex than to the base, forming a system (a) of blades, each of the blades (1 and 5), the first blade and the similar ones, having cross-sections with aerodynamic profile and the body formed of a hollow thin jacket (11), possibly with some internal stiffenings (12) mounted on the support (2) fixed to the hub (3) of the wind turbine, stiffened to each other by some crossbeams (6) having an aerodynamical shape in the cross-section, while each twin blade (4) is additionally stiffened in the rotation plane by two lateral radial supporting structures (7) built on the hub (3) by means of some cables (8) provided with some extending and damping devices (9), the cables (8) being fixed to one of the beams (6) by means of a hinge (10) located in the area of the lower part of the twin blade (4) which allows it to rotate during functioning.